At my left hand, Pulovers Macro Creator runs on my tablet pc 24/7.

Linux,KDE,Bitcoin,F-droid and everything built around them.

GCC, back in the days DJGPP in particular. As a child in the 1990s I could not afford the big name compilers like Watcom. And compared to DJGPP, all the “prized” Borland/Turbo stuff that my middle school pushed (with segmented real mode), were practically Fisher-Price and Mattel compilers.

I really like wazuh. Its such a well put together product and feels like enterprise software. One of the best cyber security tools there is.

Keepass and firefox expansion Firefox of course Ninite to install and update software Newpipe / yt vanced : youtube alternatives obsidian : note taking (not sure if this is technically open source)

Barrier KVM RustDesk Bitwarden

I'll skip all the already mentioned ones and go for a less known one, EasyTag.

I used it to organise the tags in my music collection. Super useful as you can batch fill in tags based on file structure (like author/album/song) or do the reverse and sort files in a file structure based on tags.

Qgis, Firefox! Comes top of mind

Dungeon Crawl Stone Soup!

doas pacman -Syu (arch)

doas emerge -avuDN @world (gentoo)

date-fns for saving my sanity when working with dates in JavaScript.

Bulk Crap Uninstaller

GNU/Linux Bitcoin core LND lightning LNDg

Node Red

I really like to use Shotcut for video editing and Audacity for audio related things.